The best one would be probably Arctic cooling xtreme III, it should be near silent on 7v and quiet at 12v.Gelid has one too.And there are even reports of partners stock coolers from 7970 fitting R290/x ,ICEQ from his, and they lower the temp up to 40C while being a lot quieter.Go figure.As for warranty, if you do it properly and don't rip something off, you can just put retail cooler back and they have no reason to not support the warranty.Or just wait 2 weeks for a factory mounted custom coolers.
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